Amazon's Silk Browser To Be A Data Mining Jackpot

With Silk, Amazon will be able to see what webpages Kindle Fire readers are reading, and they can mine that data to figure out which web pages are read together. Based on the pages that are read together, Amazon can build interesting web page recommendation system using collaborative filtering techniques.

Why would you use Silk over other browsers? It seems like the real benefit of precaching content does not really apply in the desktop case. You don't have near the restrictions on bandwidth, or computing power that you have on a tablet.

Also wasn't there some speculation that there might be serious issues with performance of Javascript throught the Silk system. While agree that it is a large amount of data being aggregated I would be suprised to see this anywhere other than the mobile space.

I pre-ordered a fire. Honestly if i'm reading about some random topic (i was just reading a page about econometrics) if Amazon all of the sudden started recommending me books about econometrics, i'd be okay with it. As long as the recommendations are good.

The "split browser" is not something new though. Microsoft had deepfish, Opera does that for its mobile browser I think. How do they address these concerns?